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on how we treat heart disease. health and eye yens report -- and science reporter carolyn johnson has the story jie. even through a microscope there is no mistaking the rythmic beating. these cells were created in a bay area lab, and they helped researchers unlock the secrets of how a heart becomes a heart. >> it helps to have a blueprint to know what switches exist, how they are connected and would they turn on or shut off? >> so his team at san francisco's gladstone institute set out to map the genetic switches locked in the dna of embreonic stem cells to see how a stem cell becomes a heart cell. >> so these modifications are setting the right switches to turn genes on or off so that a heart cell in this case gains its heart identity. >> jeffrey alexzander coaxed the stem cells from mice to beating heart cells. the process done in a petri dish is growth factors that mimics the environment. it is not always a precise science. >> you know, my weekends sometimes would hinge on whether i came in and sold beating cells or not. >> wons they had enough of the beating cells they began watch
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